How do I stop our Dell server from displaying "Alert! Cover was previously opened" screen at startup?

I just set up a new Dell server (Windows Server 2003) and needed to open the server. After opening it, I get an error message screen at every start up - " Alert! Cover was previously opened.
Strike F1 key to continue, F2 to run startup utility." Of course the cover is now closed.
How do I stop this screen from appearing so that I can restart the server without pushing the F1 key?
Thanks,